feat(2017): refactor day 8

Author: markkovari

2017/days/8/day08.go

@@ -0,0 +1,54 @@
+package main
+
+import (
+	"fmt"
+	"strconv"
+	"strings"
+	"github.com/markkovari/advent_of_code/aoc-go-common"
+)
+
+type Day08 struct{}
+
+func (d Day08) Part1(input string) string {
+    return fmt.Sprintf("%d", solve(input, false))
+}
+
+func (d Day08) Part2(input string) string {
+    return fmt.Sprintf("%d", solve(input, true))
+}
+
+func solve(input string, part2 bool) int {
+    registers := make(map[string]int)
+    maxSeen := 0
+    for _, line := range strings.Split(input, "\n") {
+        if line == "" { continue }
+        p := strings.Fields(line)
+        reg, op, val, condReg, condOp, condVal := p[0], p[1], p[2], p[4], p[5], p[6]
+        v, _ := strconv.Atoi(val)
+        cv, _ := strconv.Atoi(condVal)
+        
+        cond := false
+        rVal := registers[condReg]
+        switch condOp {
+        case ">": cond = rVal > cv
+        case "<": cond = rVal < cv
+        case ">=": cond = rVal >= cv
+        case "<=": cond = rVal <= cv
+        case "==": cond = rVal == cv
+        case "!=": cond = rVal != cv
+        }
+        
+        if cond {
+            if op == "inc" { registers[reg] += v } else { registers[reg] -= v }
+            for _, val := range registers {
+                if val > maxSeen { maxSeen = val }
+            }
+        }
+    }
+    if part2 { return maxSeen }
+    maxVal := 0
+    for _, val := range registers { if val > maxVal { maxVal = val } }
+    return maxVal
+}
+
+func main() { common.Run(2017, 8, Day08{}) }